Bungartz



P. BUNGARTZ Dec. 23, 1958 ROTARY PUMPS Filed May 6, 1955 2 Sheets-Sheet1 Dee. 23, 1958 P. BUNGARTZ 2,865,296

ROTARY PUMPS Filed May 6, 1955 2 Sheets-Sheetl 2 Jnvenfor I PAI/z.5a/v/l/97Z aired States 2,s65,296 normar `PUMPS Paul lllungartn,iusseldorf-berkassel, Germany Appiicaaan May e, 1955, serial No. 506,539s emma. (er. ies-ss) vided with an impeller and wherein a drive meansfor the pump is disposed above the level of the liquid.

For obtaining greater lengths of spindle and, therefore, as great asimmersion depth as possible, an upper bearing for the shaft is providedabove the level of the liquid in the form of a ball-bearing and a lowerbearing in the form of a footstep bearing Ais provided on the end whichis to be immersed in liquid. The impeller of the pump is disposed on theend of the spindle which is to be immersed in the liquid and which issurr-ounded at this place by the pump casing. These pumps have thedisadvantage that, `owing to the arrangement of the impeller at the endof the shaft to be immersed in the liquid and' owing to the weight ofthe impeller, great stress is `imposed on the foot-step bearing. Also,the pump casing which has to be lowered intofthe liquid occupies arelatively large space in the liquid to be pumped. lf the liquid to bepumped is corrosive, the impeller and the casing surrounding it must bemade of expensive material which is resistant to attack by the liquid.

If Vthe impeller and the bearings of the spindle `are arranged above thelevel of the liquid and an auxiliary impeller is provided at the freeend of the spindle which extends beyond the bearings into the liquid,the above disadvantages can be overcome. In this case, however, theimmersion depth is necessarily small and the struct tural height abovethe level of the liquid becomes somewhat great.

Since the invention permits also the actual pump partsrconsisging of theimpeller and the pump casing, even with great immersion depth, to bearranged above the level of the liquid, these parts, even when acorrosive liquid, such as hydrochloric acid, is to be pumped, need onlybe provided on the inside with acid resistant coverings which reducesthe cost of manufacture of pumps for pumping such liquids.

Pumps according to the invention are illustrated diagrammatically and byway of example in the accompanying drawings, in which:

Fig. l is a longitudinal section through one structural embodiment ofthe invention; and

Fig. 2 is a similar section through a second embodiment of theinvention.

According to the invention, in a pump of the kind set forth the impellerwheel is attached to the spindle at or near the upper end above thelevel of the liquid and at the lower end of the spindle and within thepipe which serves to convey the liquid there is provided an auxiliaryimpeller for raising the liquid in the pipe. By this means it becomespossible, while avoiding the above- 2 mentioned disadvantages, to obtain`great immersion depths, the bearing at the end of the spindle to belowered into the liquid to be pumped is at the same time relieved fromload even when the shaftwis long and `need resist no considerablestresses. Since the additional impeller needs to raise the liquidcontained in the surrounding tube only to the main impeller, it may beof small dimensions and small weight and since it conveys lthe liquid inthe axial direction of the shaft it leads to no radial stress on thebearing. The loads due tothe impeller are taken by the spindle bearingarranged above the level of the liquid. Since the bearing which isimmersed in the liquid is relieved from stress, the pump operates withgreater certainty and its life is increased, especially because thisbearing need not be lubricated by a special lubricant but can `be`lubricated by the liquid to be pumped. The construction also has afavourable inuence on the total dimensions and material requirements.

Referring to Fig. `1 of the drawing, the spindle `1 is carried in a ballbearing 2 above the :level of the liquid and in a footstep bearing '5 inan immersion pipe 4 which surrounds the spindle 1 and extends from thepump casing 3. The bearing 5 is disposed at the `end of the pipe to belowered `into the liquid. `A main impeller 6 is arranged in the pumpcasing which is also disposed above the level of the liquid. Above thebearing 5 there is provided an auxiliary impeller '7 which. is mountedon the spindle and which, when the pump is set in operation, raises theliquid in the .pipe 4 until lit reaches the impeller. t l

The spindle or shaft 'l is driven by the motor 14 having a shaft '1Swhich is lconnected to the shaft 1 by means of a coupling I6. Motor 14is mounted upon a cylindrical casing 17 which `is seated upon the i pumphousing `3 and secured by means of bolts 18 (only one is shown) to aflange 19 which supports thehousing Blof the pump. The flange I9 isfastened by'means of bolts such as 21 to flange 20 on the tank orcontainer 22. Housing Sis provided with a pump discharge member 23.

It is particularly advantageous if, in the pump in accordance with theinvention, the spindle is hollow and its end which is lowered into theliquid is closed and a fixed rod extends from the opposite end into thehollow spindle and engages a bearing in the spindle. This affords theadvantage that no bearing which is subject to lattack or corrosion ispresent in the liquid to be pumped and even when corrosive and dirtylengths have tobe pumped, large immersion depths can be obtained byusing a long spindle which was not hitherto possible owing to the lackof suitable materials for the bearing.

ln Fig. 2 the vertical pump spindle is designated by the numeral il. Thespindle is hollow and is closed at the end 9 which is to be lowered intothe liquid. A fixed supporting rod lt) extends into the hollow spindleand is carried by a flanged disc 11 above the level of the liquid. Thehollow spindle 8 is provided with an inner bearing member l2 which isengaged by the end 13 of the stationary rod l@ thus forming a supportbearing for spindle 8.

The flange disk lll is mounted upon housing 17', which in turn is`seated on housing 3 of the pump and secured by means of screws 18 tothe flange 19 which .supports the housing. This ange 19 again is securedto llange 2u on the liquid container 22 by means of belts 2l. The pumphousing 3' is also provided with a discharge member 23.

Hollow shaft 8 is driven by motor 14' which is mounted o-n an arm 25 ofthe supporting housing 17. A V-belt pulley 26 on motor 14 is connectedby means of V belts 27 to the pulley 28, which is secured to a aaaaaeerotatable extension 29 of hollow shaft 8 which is thus rotated aroundthe stationary rod 10.

I claim:

l. A rotary pump of the type comprising a vertically disposed hollow andelongated impeller spindle closed at its lower immersible end andhaving'an internal bearing proximate said lower end, a main impellercarried by said spindle and disposed above the level of the liquid to bepumped, an upper bearing disposed above said main impeller and rotatablysupporting said spindle and said impeller, drive means for said spindledisposed proximate the upper end of said spindle above said mainimpeller, a suction pipe disposed around and extending longitudinally ofsaid spindle below said main impeller, an auxiliary impeller supportedon said spindle within the lower end of said pipe, a stationary shaftsupporting member disposed above said upper spindle bearing and astationary shaft extending upwardly into said supporting member anddownwardly into said spindle, the lower end of said shaft having bearingengagement with said internal bearing and providing stationary supportfor said spindle proximate the lower end thereof.

2. A rotary pump of the type comprising a vertically disposed hollowVand elongated impeller spindle closed at its lower immersible end andhaving an internal bearing proximate said lower end, a main impellercarried by said spindle and disposed above the level of the liquid to bepumped, an upper bearing disposed above said main impeller and rotatablysupporting said spindle and said impeller, drive means for said spindledisposed proximate the upper end' of said spindle above said mainimpeller, a suction pipe disposed around and extending longitudinally ofsaid spindle below said main impeller, an auxiliary impeller supportedon said spindle within the lower end of said pipe, a statonaryshaftsupporting member disposed above said upper spindle bearing and astationary shaft extending upwardly into said supporting member anddownwardly into said spindle, the lower end of said shaft having bearingengagement with said internal bearing and providing stationary supportfor said spindle proximate the lower end thereof, said suction pipebeing continuous and of cylindrical conformation in a manner permittingunobstructed removal of said spindle and said auxiliary impeller fromsaid pipe.

3. A rotary pump of the type comprising a vertically disposed hollow andelongated impeller spindle closed at its lower immersible end and havingan internal bearing proximate said lower end, a main impeller carried bysaid spindle and disposed above the level of the liquid to be pumped, anupper bearing disposed above said main impeller and rotatably supportingsaid spindle and said Y impeller, drive means for said spindle disposedproximate the upper end of said spindle above said main impeller, asuction pipe disposed around and extending longitudinally of saidspindle below said main impeller, an auxiliary impeller supported onsaid spindle Within the lower end of said pipe, a stationary shaftsupporting member disposed above said upper spindle bearing and astationary shaft extending upwardly into said supporting member anddownwardly into said spindle, the lower end of said shaft having bearingengagement with said internal bearing and providing stationary supportfor said spindle proximate the lower end thereof, said drive meansincluding a drive member disposed around said spindle above said upperbearing and below said stationary shaft l supporting member.

Referenees Cited in the lile of this patent UNITED STATES PATENTS975,526 Hood Nov. 15, 1910 1,429,487 Budlong Sept. 19, 1922 1,554,472Ulmann Sept. 22, 1925 2,013,078 Slocum Sept. 3, 1935 2,766,695 GailloudOct. 16, 1956 FOREIGN PATENTS 21,203 Netherlands Aug. 15, 1929 372,145 YFrance Mar. 26, 1907 662,614 Great Britain Dec. 5, 1951 806,635 GermanyJuly 9, 1951

